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arXiv 1412.2173astro-ph.SR
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耀斑硬X射线准周期脉动的多周期性:个例研究

Multiperiodicity in quasi-periodic pulsations of flare hard X-rays: a case study

M. Tomczak, Z. Szaforz

摘要:

我们给出了一个太阳耀斑(SOL 2001 -10- 02 T17:31)的实例研究,它在硬X射线中表现出两个同时激发的周期P_1 = 26-31 s和P_2 = 110 s的准周期脉动(QPP)。由Yohkoh望远镜记录的耀斑的完整演变,以及SOHO/EIT巡逻图像,使我们能够确定负责特定时期的磁结构,并提出一个与现有观测结果一致的总体方案。也就是说,我们认为,新兴的磁通量发起了重新连接与腿的一个大拱廊的日冕循环,已经存在于一个活跃的地区几天。重联同时在两个磁结构中激发MHD振荡:周期P_1在出现的环和重联的结果环中产生;周期P_2在拱圈中产生。两个共振器产生不同光谱的光子。我们预计,硬X射线的多周期性可能是耀斑混合体的一个共同特征,即不同大小的磁结构相互作用的事件。

英文摘要:

We present a case study of the solar flare (SOL2001-10-02T17:31) that showed quasi-periodic pulsations (QPPs) in hard X-rays with two simultaneously excited periods, P_1 = 26-31 s and P_2 = 110 s. Complete evolution of the flare recorded by the Yohkoh telescopes, together with the patrol SOHO/EIT images, allowed us to identify magnetic structures responsible for particular periods and to propose an overall scenario which is consistent with the available observations. Namely, we suggest that emerging magnetic flux initiated the reconnection with legs of a large arcade of coronal loops that had been present in an active region for several days. The reconnection excited MHD oscillations in both magnetic structures simultaneously: period P_1 was generated in the emerging loop and in a loop being a result of the reconnection; period P_2 occurred in the arcade. Both resonators produced photons of different spectra. We anticipate that multiperiodicity in hard X-rays can be a common feature of flare hybrids, i.e. the events, in which magnetic structures of different sizes interact.

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